EP0435620A1 - Pneumatique à carcasse radiale pour une voiture particulière - Google Patents

Pneumatique à carcasse radiale pour une voiture particulière Download PDF

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Publication number
EP0435620A1
EP0435620A1 EP90314172A EP90314172A EP0435620A1 EP 0435620 A1 EP0435620 A1 EP 0435620A1 EP 90314172 A EP90314172 A EP 90314172A EP 90314172 A EP90314172 A EP 90314172A EP 0435620 A1 EP0435620 A1 EP 0435620A1
Authority
EP
European Patent Office
Prior art keywords
tyre
layer
tread
belt
loss factor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90314172A
Other languages
German (de)
English (en)
Other versions
EP0435620B1 (fr
Inventor
Masahiro Oku
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP0435620A1 publication Critical patent/EP0435620A1/fr
Application granted granted Critical
Publication of EP0435620B1 publication Critical patent/EP0435620B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C3/00—Tyres characterised by the transverse section
    • B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
    • B60C11/005—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers

Definitions

  • the present invention relates to a radial tyre for a passenger car capable of reducing fuel consumption.
  • Radial tyres are used widely owing to their high steering stability, high speed durability, low noise performance, high wear resistance and low fuel consumption. Recently such tyres have been used at higher internal pressure to further enhance the low fuel consumption property.
  • a radial tyre for a passenger car comprises a carcass layer composed of carcass cords arranged substantially in the radial direction and extending through a tread part, side wall parts and wrapped at each edge of the carcass layer around a bead core in each of two beads from the inside to the outside of the tyre, and a belt layer composed of at least two belt plies, each comprising steel cords parallel to each other, arranged radially outside the carcass layer, wherein the tread part comprises a tread rubber having a base rubber layer arranged outside the belt layer, the loss factor tan ⁇ (b) of which is 0.03 to 0.08, and a cap rubber layer arranged outside the base rubber layer, the loss factor tan ⁇ (c) of which is 0.06 to 0.10 and is larger than the loss factor tan ⁇ (b) of the base rubber layer; the steel cord of the belt ply being composed of four or less steel filaments; and in a cross section of the tyre including
  • the tread rubber is composed of two layers differing in loss factor, the low fuel consumption is obtained while maintaining the grip performance. If, however, the loss factor tan ⁇ (c) of the cap rubber layer is greater than 0.10 or the loss factor tan ⁇ (b) of the base rubber layer is greater than 0.08, the improved effect of low fuel consumption is not achieved. Although the grip performance of the tyre is largely affected by the tread pattern formed on the tread, if the loss factor tan ⁇ (c) of the cap rubber layer is smaller than 0.06, the grip performance is lowered too much to allow compensation by the tread pattern design.
  • the cap rubber layer contacting with the road surface exhibits good grip performance, and the base rubber layer which is arranged inwardly decreases the rolling resistance due to hysteresis loss.
  • the internal pressure causes tension to be applied to the cords of the belt layer.
  • the number of filaments of a cord is five or more, the circumferential rigidity of the entire belt layer is increased, and the curvature rigidity of the outer surface of the belt layer is also increased.
  • the ride comfort is sacrificed by the lowering of envelope performance. Therefore, when the number of filaments is limited to four or less, then if used at high air pressure, loss of ride comfort is suppressed.
  • the number of filaments as four or less, the traceability of the tread surface on the road surface changes is improved, and the shortage of grip which would be expected otherwise due to the loss factor tan ⁇ (c) of the cap rubber layer being limited to 0.10 or less is compensated.
  • the ratio Tr2/Tr1 of the tread curvature radius Tr1 when inflated to 2% of specified internal pressure and the tread curvature radius Tr2 when inflated to the specified internal pressure is defined as 1.0 to 2.0 the radius of curvature of the tyre tread part increases due to inflation pressure.
  • compressive strain is applied in the axial direction of the tyre to the tread rubber, and the characteristics of the tread rubber of low loss factor may be effectively obtained and seen, thus lowering the fuel consumption loss of the tread due to high speed travelling.
  • the radial tyre 1 for a passenger car comprises a carcass 6 of carcass cords extending from a tread part 2 through side wall parts 3 and wrapped around a bead core 5 in each of two bead parts 4 from inside to outside of the tyre.
  • the carcass cords are arranged substantially in the radial direction, in this embodiment at an angle of 75 to 90 degrees with respect to the tyre circumferential direction.
  • the carcass cords may be made of polyester, nylon, aromatic polyamide, other organic fibre cords, or metallic cords.
  • the carcass 6 is formed by one simple ply so as to lower the rigidity of the side walls, and thus improve the ride comfort.
  • a belt layer 7 composed of at least two belt plies each comprising steel cords arranged parallel to each other.
  • the belt layer 7 is composed of two belt plies, one is radially inside the other.
  • the steel cords are at a small angle to the tyre circumferential direction, for example 10 to 30 degrees, and the steel cords of the adjacent plies are arranged to cross each other.
  • the steel cord is formed of four or less steel filaments 9 as shown in Figure 2(a), 2(b) or 2(c).
  • Figure 2(a) shows the structure of a 1x4 cord
  • Figure 2(b) shows the structure of a 1x3 cord
  • Figure 2(c) shows the structure of a 1x2 cord respectively.
  • the tyre of the invention in use is inflated with an air pressure (for example 230 to 250 kPa) higher than the ordinary internal pressure. Due to this high internal pressure, a large tension is applied to each cord of the belt layer 7. If the number of filaments of the cord was made five or more, then the circumferential rigidity of the entire belt layer 7 would be increased due to the tension from the air pressure, and the bending rigidity of the outer surface of the belt layer 7 is increased. As a result, the envelope performance is lowered, and the ride comfort is sacrificed. By particularly defining the number of steel filaments to be four or less, and preferably three or less, loss of ride comfort is suppressed even when used at high air pressure.
  • an air pressure for example 230 to 250 kPa
  • the tread part 2 comprises a tread rubber 10 disposed outside the belt layer 7 in the radial direction.
  • the tread rubber 10 is composed of two layers, that is a base rubber 10B arranged radially inside and a cap rubber 10C arranged radially outside the base rubber 10B.
  • the loss factor tan ⁇ (c) of the cap rubber layer 10C is specified to be 0.06 to 0.10 and to be greater than the loss factor tan ⁇ (b) of the base rubber 10B. Also the loss tangent tan ⁇ (b) of the base rubber layer 10B is 0.03 to 0.08.
  • the loss factor (tan ⁇ ) is the value measured by a visco-elasticity measuring apparatus of Iwamoto Seisakusho, in the conditions of temperature of 70°C, amplitude of 1.0%, and frequency of 10 Hz.
  • the tread rubber 10 is made of two different rubber layers (cap rubber layer 10C and base rubber layer 10B) and each layer has its own special loss factor, low fuel consumption is achieved while maintaining the grip performance. If the loss factor tan ⁇ (c) of the cap rubber layer 10C is made greater than 0.10 or if the loss factor tan ⁇ (b) of the base rubber layer 10B is made greater than 0.08, the effect of low fuel consumption is not obtained.
  • the grip performance of the tyre is lowered if the loss factor tan ⁇ (c) if smaller than 0.06.
  • the loss factor tan ⁇ (b) of the base rubber layer 10B is smaller than 0.03, it is too difficult to manufacture.
  • the relation where tan ⁇ (b) ⁇ tan ⁇ (c) is defined so as to enhance the grip performance of the tyre by means of the cap rubber layer 10C, and decrease the rolling resistance due to hysteresis loss of the base rubber layer 10B.
  • the ratio Tr2/Tr1 of the tread radius of curvature Tr1 when the tyre 1 is mounted on its specified rim and inflated to 2% of the specified internal pressure to the tread radius of curvature Tr2 when inflated to the specified internal pressure is 1.0 to 2.0.
  • the ground contact ends P are determined from the ground contact shape when the maximum standard load is applied by inflating the specified rim to its specified internal pressure.
  • the ratio Tr2/Tr1 is defined in the range of 1.0 to 2.0 in order to lower the fuel consumption and prevent damage of the tread part due to high speed running.
  • the ratio Tr2/Tr1 exceeds 2.0, the rolling resistance is increased, and the object of the invention is not achieved.
  • a tensile stress in the widthwise direction is applied to the tread from inflation pressure, probably inducing damage of the tread rubber or so-called chunking near the tyre equatorial plane while travelling at high speed, in particular.
  • the ratio of Tr2/Tr1 is set at 1.3 to 1.8.
  • the rolling resistance ratio is the value of measurement in the standard maximum load condition, by a bench-top drum testing machine after fitting the tyres upon specified rims and adjusting the internal pressure to 240 kPa, expressed as a ratio taking the value of reference Example 1 as 100.
  • the actual car ride comfort was a driver's functional evaluation running on a test course, with the tyres on the specified rims, internal pressure of 240 kPa and testing on a Japanese-made passenger car with a displacement of 1500 cc, expressed in comparison with reference Example 1 as 100.
  • the value of the rolling resistance ratio is smaller, it means the fuel consumption is lower, and as the value of the actual car ride comfort evaluation is greater, it means the result is better.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
EP19900314172 1989-12-29 1990-12-21 Pneumatique à carcasse radiale pour une voiture particulière Expired - Lifetime EP0435620B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1341265A JPH03204307A (ja) 1989-12-29 1989-12-29 乗用車用ラジアルタイヤ
JP341265/89 1989-12-29

Publications (2)

Publication Number Publication Date
EP0435620A1 true EP0435620A1 (fr) 1991-07-03
EP0435620B1 EP0435620B1 (fr) 1994-09-07

Family

ID=18344707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900314172 Expired - Lifetime EP0435620B1 (fr) 1989-12-29 1990-12-21 Pneumatique à carcasse radiale pour une voiture particulière

Country Status (3)

Country Link
EP (1) EP0435620B1 (fr)
JP (1) JPH03204307A (fr)
DE (1) DE69012302T2 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554108A1 (fr) * 1992-01-29 1993-08-04 Bridgestone Corporation Bandages pneumatiques radiaux
EP0593288A1 (fr) * 1992-10-14 1994-04-20 Sumitomo Rubber Industries Limited Bandage pneumatique
US5595619A (en) * 1992-10-14 1997-01-21 Sumitomo Rubber Industries, Ltd. Pneumatic tire including shoulder parts
US5688342A (en) * 1993-12-27 1997-11-18 Sumitomo Rubber Industries, Ltd. Pneumatic tire having ground contacting area
US5733393A (en) * 1996-01-17 1998-03-31 The Goodyear Tire & Rubber Company Tire having good diverse properties
EP1384601A1 (fr) * 2002-07-23 2004-01-28 Ralf Bohle GmbH Bandage pneumatique pour véhicule
US7784510B2 (en) * 2005-10-17 2010-08-31 Sumitomo Rubber Industries, Ltd. Heavy duty tire having cap and base rubber layers, belt cushion rubber and sidewall rubber
US20140311647A1 (en) * 2011-10-25 2014-10-23 Bridgestone Corporation Heavy load pneumatic radial tire
DE102016213186A1 (de) * 2016-07-19 2018-01-25 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Überprüfung des Rollwiderstandes von Fahrzeugreifen

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3287795B2 (ja) * 1997-12-16 2002-06-04 住友ゴム工業株式会社 空気入りタイヤ
CN102513701B (zh) 2008-01-07 2015-08-19 株式会社Ihi 激光退火方法以及装置
DE102008029622B4 (de) 2008-06-23 2018-05-09 Ihi Corporation Laserglühverfahren und Laserglühvorrichtung
JP5952587B2 (ja) * 2012-02-23 2016-07-13 住友ゴム工業株式会社 空気入りタイヤ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3222957A1 (de) * 1981-06-24 1983-01-13 The Toyo Rubber Industry Co., Ltd., Osaka Laufflaeche fuer fahrzeugreifen
US4385653A (en) * 1979-12-31 1983-05-31 Toyo Rubber Industry Co., Ltd. Pneumatic tire having a tread constructed of at least two kinds of rubbers
US4399853A (en) * 1980-08-11 1983-08-23 Bridgestone Tire Co., Ltd. Metal cord-rubber composite materials
EP0194108A2 (fr) * 1985-03-01 1986-09-10 Sumitomo Rubber Industries Limited Bandage pneumatique ayant un profil de la carcasse
EP0292563A1 (fr) * 1986-10-22 1988-11-30 Sumitomo Rubber Industries Limited Pneu radial de vehicules automobiles pour le transport de passa gers et production dudit pneu

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2538868B2 (ja) * 1985-12-10 1996-10-02 株式会社ブリヂストン 運動性能及び耐久性に優れた乗用車用ラジアルタイヤ
JP2573260B2 (ja) * 1987-11-25 1997-01-22 住友ゴム工業 株式会社 空気入りラジアルタイヤ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4385653A (en) * 1979-12-31 1983-05-31 Toyo Rubber Industry Co., Ltd. Pneumatic tire having a tread constructed of at least two kinds of rubbers
US4399853A (en) * 1980-08-11 1983-08-23 Bridgestone Tire Co., Ltd. Metal cord-rubber composite materials
DE3222957A1 (de) * 1981-06-24 1983-01-13 The Toyo Rubber Industry Co., Ltd., Osaka Laufflaeche fuer fahrzeugreifen
EP0194108A2 (fr) * 1985-03-01 1986-09-10 Sumitomo Rubber Industries Limited Bandage pneumatique ayant un profil de la carcasse
EP0292563A1 (fr) * 1986-10-22 1988-11-30 Sumitomo Rubber Industries Limited Pneu radial de vehicules automobiles pour le transport de passa gers et production dudit pneu

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554108A1 (fr) * 1992-01-29 1993-08-04 Bridgestone Corporation Bandages pneumatiques radiaux
EP0593288A1 (fr) * 1992-10-14 1994-04-20 Sumitomo Rubber Industries Limited Bandage pneumatique
US5595619A (en) * 1992-10-14 1997-01-21 Sumitomo Rubber Industries, Ltd. Pneumatic tire including shoulder parts
US5810953A (en) * 1992-10-14 1998-09-22 Sumitomo Rubber Industries, Ltd. Pneumatic tire including two grooves and two rubber parts
US5688342A (en) * 1993-12-27 1997-11-18 Sumitomo Rubber Industries, Ltd. Pneumatic tire having ground contacting area
US5733393A (en) * 1996-01-17 1998-03-31 The Goodyear Tire & Rubber Company Tire having good diverse properties
EP1384601A1 (fr) * 2002-07-23 2004-01-28 Ralf Bohle GmbH Bandage pneumatique pour véhicule
US7784510B2 (en) * 2005-10-17 2010-08-31 Sumitomo Rubber Industries, Ltd. Heavy duty tire having cap and base rubber layers, belt cushion rubber and sidewall rubber
US20140311647A1 (en) * 2011-10-25 2014-10-23 Bridgestone Corporation Heavy load pneumatic radial tire
US9849725B2 (en) * 2011-10-25 2017-12-26 Bridgestone Corporation Heavy load pneumatic radial tire with cap tread rubber, base tread rubber, and reinforcing rubber layer
DE102016213186A1 (de) * 2016-07-19 2018-01-25 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur Überprüfung des Rollwiderstandes von Fahrzeugreifen

Also Published As

Publication number Publication date
DE69012302D1 (de) 1994-10-13
DE69012302T2 (de) 1995-01-05
JPH03204307A (ja) 1991-09-05
EP0435620B1 (fr) 1994-09-07

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